Free-format data can easily be
read with list input because you do not need to specify column
locations of the data. You simply list the variable names in the
same order as the corresponding raw data fields. You must
distinguish character variables from numeric variables by using the
dollar ($) sign.
When characters other than
blanks are used to separate the data values, you can specify the
field delimiter by using the DLM= option in the INFILE
You can also specify a range ...